I follow the developpment since the very begginning, but until the release I could only play the demo version (because I couldn't take the chance to buy the game soon enough)...

After nearly having finished the game (I mean, the 'bad end') I have to say that this game held its promises, and soon became one of my favourites (along with MagicalStarsign and VA-11 HALL-A, that have nothing to do with it).

Worlds will give you...
-A long, stunning story, without that much long pauses,
-Very fun and diverses games mechanics (stealth, action, puzzle, social...)
-Important characters and background,
-Game design and art truely impressive,
-A vast array of worlds to explore,
-This game knows how to play with feels... A lot.

This isn't all that I could say about it, but I think you get it. This is one of the games that made me who I am: one of the few games that filled me up with the feeling that one day, I'd want to be a game developper myself.

This game do, however, have some negative points (depending of your player type)...
-Very long puzzles (even if you choose the easy way),
-No multiplayer for the 'VR simulator' (that could've been a good idea if you think about it).

I don't think this review is very objective, but I think that everyone should -- at least, play the demo version to get the idea. One last point: everyone who loved playing Zelda, MetalGearSolid or even Myst will enjoy this game. It's designed for real players, offering difficult bosses (not THAT hard but depending of your skill level, it can be a pain), a sory-rich and alive world and real gameplay.

-Update-
After having now truely finished the game, there's only one thing I can say: the story is really, really good and complex, the soundtrack is ok-tier (but can really shine at times) and the level-design is used as a canvas to tell the silent story you weren't told during dialogues (as any good game would do). What would put it as GOTY for me? Well... I don't know, but if there's one thing to say about this game, it's simply 'Try it!'